Shelf



FIG. 1 is a front perspective view of a shelf showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a rear plan view thereof;

FIG. 8 is a first front elevation view of the shelf in a folded configuration thereof;

FIG. 9 is a second front elevation view of the shelf in the folded configuration thereof;

FIG. 10 is a front perspective view of the shelf in the folded configuration thereof;

FIG. 11 is a third front elevation view of the shelf in the folded configuration thereof; and,

FIG. 12 is a rear plan view of the shelf in the folded configuration thereof. 

CLAIM The ornamental design for a shelf, as shown and described. 